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3 years ago

What is the function of the brain?

Physics

2 answers:

AfilCa [17]3 years ago

8 0

Answer:

It assembles the messages in a way that has meaning for us, and can store that information in our memory. The brain controls our thoughts, memory and speech, movement of the arms and legs, and the function of many organs within our body.

Explanation:

erastovalidia [21]3 years ago

5 0

Answer:

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Most solar energy that reaches earths atmospere is ..

NNADVOKAT [17]

It’s A because energy passes freely through the atmosphere and is absorbed by earths surface.

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3 years ago

What is the efficiency of a device that takes in 400 J of heat and does 120 J

777dan777 [17]

The efficiency of the device is 30 %

Explanation:

The efficiency of a heat engine is given by:

$\eta = \frac{W}{Q_{in}}$

where

W is the work done by the engine

$Q_{in}$ is the heat in input to the engine

For the device in this problem, we have:

W = 120 J is the work done

$Q_{in} = 400 J$ is the heat in input

Substituting, we find the efficiency:

$\eta=\frac{120}{400}=0.30$

which corresponds to an efficiency of 30%.

Learn more about work:

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3 years ago

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3. Question

aalyn [17]

2. Newton's laws of motion

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3 years ago

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A block of mass 0.84 kg is suspended by a string which is wrapped so that it is at a radius of 0.061 m from the center of a pull

lora16 [44]

Answer:

$E_l = 1.713 J$

Explanation:

Given data:

mass of block is $M_b = 0.84 kg$

radius of block = 0.061 m

moment of inertia is $6.20 \times 10^{-3} kg m^2$

D is distance covered by block = 0.65 m

speed of block is 1.705 m/s

From conservation of momentum we have

$M_b g D = \frac{1}{2} M_b v^2 + \frac{1}{2} I \omega^2 + E_{loss}$

$0.84 \times 9.81 \times 0.65 = \frac{1}{2}\times 0.84 \times 1.705^2 +\frac{1}{2} \times 6.2 \times 10^{-3} [\frac{1.705}{0.061}]^2 + E_l$

solving for energy loss

$E_l = 1.713 J$

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3 years ago

Refraction or the bending of waves takes place when a light wave changes A) color. B) frequency. C) intensity. D) speed.

DENIUS [597]

The answer is D. speed

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4 years ago

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